Fix PHP warning when 1st argument of parse_host() is not a string (#1489486)

Aleksander Machniak

2013-12-20 f6d23a8dce6258f954257174bc03f2b85a21afdf

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require ["include"];
include "script.sieve";
# rule:[two]
if true
{
    include :optional "second.sieve";
}